class 10 science. state Ohm's law. write the necessary condition for its validity. how is this lawei verified experimentally? what will be the nature of graph between potential difference and current for a conductor?
Answers
Explanation:
The value of V/I = R (constant) Plot a graph between V and I by taking V along X- axis along. We get a straight line passing through origin. Conclusion : From the graph between V and I, we conclude that I = V, which is Ohm's law. Hence Ohm's law is verified experimentally.
OHM'S LAW
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Ohm’s law, description of the relationship between current, voltage, and resistance. The amount of steady current through a large number of materials is directly proportional to the potential difference, or voltage, across the materials. Thus, if the voltage V (in units of volts) between two ends of a wire made from one of these materials is tripled, the current I (amperes) also triples; and the quotient V/I remains constant. The quotient V/I for a given piece of material is called its resistance, R, measured in units named ohms. The resistance of materials for which Ohm’s law is valid does not change over enormous ranges of voltage and current. Ohm’s law may be expressed mathematically as V/I = R. That the resistance, or the ratio of voltage to current, for all or part of an electric circuit at a fixed temperature is generally constant had been established by 1827 as a result of the investigations of the German physicist Georg Simon Ohm